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ategory 1 Failures - Dead or No Response, No Display,
Unreadable Display, or Error Messages on the Display
his category of failure usually involves one of the following:
A defective A6 power supply
A defective A2 CPU
Poor contact with the rear plane connector board
A digital failure in any board assembly
A defective display
Troubleshooting A6 Power Supply Assembly Problems
Begin here if the problem appears to be power supply related.
Check the Rear Panel L Ds
Switch the analyzer's line power ON. Check the condition of the two LEDs visible through the
hole in the rear panel to the right of the AC power plug.
If the green LED is on and the red LED is o :
his represents a normal condition. Continue with \Measure the Power Supply Voltages" to
con rm that the power supplies are functioning properly.
If neither LED is on:
Check the line fuse, located in a holder above the AC power jack, and replace it with the spare
provided if necessary. Check the AC power line. If the LEDs are still o , replace the power
supply.
If the green LED is on, the red LED is on steadily, and the fan is o :
Check the line voltage selector switch, located below the AC power jack. If it is correct,
remove the power supply/display assembly and make sure that the cable from the on/standby
switch to the power supply assembly is connected.
With the power supply/display assembly outside the analyzer, plug it in and switch the
analyzer's line power ON.
If the fan is still o :
Check the four green power supply LEDs visible from the right side of the display enclosure
(as viewed from the front). If the LEDs are on, the fan is probably broken. Replace the fan or
the entire power supply assembly.
If the green LED is on, the red LED is on steadily, and the fan is on:
Go to \Measure the Power Supply Voltages." Note that it is normal for both the green and red
LEDs to be on when the power switch is in S ANDBY, but not when the switch is in the ON
position.
If the green LED is on, and the red LED is blinking:
he power supply is in shutdown. Remove the power supply/display assembly from analyzer,
plug it in and switch the analyzer's line power ON.
T roubleshoot ng and Block D agrams
4-7
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